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Optimal User Clustering and Power Allocation in NOMA Systems NOMA系统中最优用户聚类与功率分配
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9943029
Tanaka Tai, Nguyen Thi Xuan Uyen, D. L. Khoa
Non-orthogonal multiple access (NOMA) is one of the proposed techniques which improve transfer speeds. There are two primary types of NOMA: code domain and power domain. This study focuses on the power domain. The benefit of power-domain NOMA depends on how the users are clustered and the power levels of users in the same cluster. This study aims to propose the model using the two-user pairing method and three users together, combining the threshold signal-to-noise ratio (SNR) levels to decide on two or three pairings to ensure the quality of service (QoS) for users. Besides, this model consider the optimal power allocation (PA) for each user in the cluster to the maximum sum rate with QoS constraints. Simulation results show the benefits of optimizing user clustering and power allocation with QoS constraints.
非正交多址(NOMA)是提出的提高传输速度的技术之一。NOMA主要有两种类型:代码域和功率域。本研究的重点是功率域。功率域NOMA的好处取决于用户集群的方式以及同一集群中用户的功率级别。本研究旨在提出采用两用户配对方法和三个用户一起使用的模型,结合阈值信噪比(SNR)水平来决定两个或三个配对,以保证用户的服务质量(QoS)。此外,该模型在QoS约束下考虑集群中每个用户的最优功率分配(PA)以最大和速率。仿真结果表明了在QoS约束下优化用户聚类和功率分配的好处。
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引用次数: 1
High Gain Microstrip Patch Antenna Array using Air-Filled Substrate Integrated Waveguide (AFSIW) Feeding Structure 采用充气衬底集成波导馈电结构的高增益微带贴片天线阵列
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9943028
Nhu-Huan Nguyen, A. Ghiotto, M. Le, T. Vuong
This paper presents a microstrip patch antenna array fed by a multilayer air-filled substrate integrated waveguide (AFSIW) structure. Thanks to the low loss feeding network, the antenna array presents high efficiency in millimeter wave frequencies. For demonstration, a 1×2 antenna array operating at 28 GHz is designed for 5G applications, which shows a realized gain of 10.8 dBi and a total efficiency higher than 90%. The proposed structure can be expanded to M×(2N) antenna array.
提出了一种由多层充气衬底集成波导结构馈电的微带贴片天线阵列。由于馈电网络的低损耗,天线阵列在毫米波频率上表现出高效率。为了进行演示,设计了一个工作在28 GHz的1×2天线阵列,用于5G应用,其实现增益为10.8 dBi,总效率高于90%。该结构可扩展为mx (2N)天线阵列。
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引用次数: 1
Pilot Enrichment Methods for Improving Quality of Received Signal in Underwater Acoustic OFDM Systems 提高水声OFDM系统接收信号质量的导频富集方法
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9943030
Thi Nga Nguyen, H. Phan, V. Cao, Thi Huyen Nguyen, Pham Thanh Hiep
In OFDM systems, pilots are usually sent along with the data carriers to calculate channel impulse response (CIR) for channel estimation. However, transmitted signals are normally distorted by many environmental factors when propagating through underwater communication channels. Thus, the original pilots seem to be not enough to recover “good” CIR for channel estimation in underwater acoustic OFDM (UWA-OFDM) systems. Recent studies have developed data pilot-aided (DPA) strategies, known as STA and CDP, for time-variant channels like vehicle-to-vehicle (V2V) communications. These methods work on the assumption of high cross-correlation of CR between two adjacent data symbols and the support of two long training symbols in the IEEE 802.11p packet. These conditions are not provided in the UWA-OFDM systems, which leads to be infeasible to apply existing DPA strategies. Therefore, this paper introduces a novel pilot enrichment (PE) method for improving the performance of the channel estimation in UWA-OFDM systems. The core idea is that some data subcarriers are extracted under a condition related to constellation mapping for creating supplementary “pilots”. The “pilots” are used together with the original pilots for channel estimation. Our method is evaluated in comparison to the MMSE estimation on various modulation schemes. The experimental results illustrate that the PE estimator can perform better than the MMSE estimator in terms of bit error rate (BER), especially on medium and high SNR values.
在OFDM系统中,导频通常与数据载波一起发送,用于信道估计的信道脉冲响应(CIR)计算。然而,在水下通信信道中传输的信号通常会受到多种环境因素的干扰。因此,在水声OFDM (UWA-OFDM)系统中,原始导频似乎不足以恢复“良好”的信道估计CIR。最近的研究开发了数据导航辅助(DPA)策略,称为STA和CDP,用于时变信道,如车对车(V2V)通信。这些方法基于两个相邻数据符号之间CR的高互相关和支持IEEE 802.11p数据包中的两个长训练符号的假设。这些条件在UWA-OFDM系统中不具备,导致现有的DPA策略无法应用。为了提高UWA-OFDM系统的信道估计性能,本文提出了一种新的导频富集(PE)方法。其核心思想是在星座映射相关的条件下提取部分数据子载波,创建补充“导频”。“导频”与原始导频一起用于信道估计。我们的方法与各种调制方案的MMSE估计进行了比较。实验结果表明,PE估计器在误码率(BER)方面优于MMSE估计器,特别是在中高信噪比的情况下。
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引用次数: 0
A Simplified Judgment to Enhance Decoding Performance of 5G NR Physical Uplink Control Channel Format 2 with Reed-Muller Code 利用Reed-Muller码提高5G NR物理上行控制信道格式2译码性能的简化判断
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9942971
D. Phan, Luong Xuan Hao, Nguyen Trung Tien, Duong Van Hoan
This paper proposes a simplified judgment to improve decoding performance of physical uplink control channel (PUCCH) format 2 using Reed-Muller code in fifth-generation new radio (5G NR). In this paper, descrambled sequence is divided into two halves and they are sequentially decoded. To obtain information bits and transmission state, this paper only compares decoding results of two halves with the full sequence instead of considering the additional result between two halves. In other words, discontinuous transmission (DTX) judgment becomes less strictly in order to reduce acknowledge missed detection probability (PACK). As a result, decoding process is not only simpler but it also offers significant improvement in terms of PACK. On the other hand, DTX to ACK probability (PDTX) is steadily managed within the allowable threshold although it is slightly increased due to the trade-off relationship with PACK. Feasibility of the proposed method is experimentally validated with different receiving antenna numbers under practical condition. The acquired results shows that the proposed approach is suitable for practical applications since it fully complies with all technical requirements by the 3rd generation partnership project (3GPP).
为了提高第五代新无线电(5G NR)中物理上行控制信道(PUCCH)格式2的解码性能,提出了一种简化的Reed-Muller码判断方法。本文将解扰序列分成两半,依次解码。为了获得信息位和传输状态,本文只将两半解码结果与全序列进行比较,没有考虑两半之间的附加结果。换句话说,不连续传输(DTX)的判断变得不那么严格,以降低确认漏检概率(PACK)。这样不仅简化了解码过程,而且在PACK方面也有了很大的改进。另一方面,DTX到ACK概率(PDTX)被稳定地管理在允许的阈值内,尽管由于与PACK的权衡关系,它会略微增加。在实际条件下,通过不同接收天线数的实验验证了该方法的可行性。实验结果表明,该方法完全符合3GPP(第三代合作伙伴计划)的各项技术要求,适合实际应用。
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引用次数: 0
Fast Optimal Resource Allocation for Resilient Service Coordination in an NFV- Enabled Internet-of- Things System 基于NFV的物联网系统弹性业务协调快速优化资源分配
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9943001
Tuan-Minh Pham, T. Nguyen, Xuan-Tuan-Trung Nguyen, Hoai-Nam Chu, Ngô Hồng Sơn
Network Functions Virtualization (NFV) is a new way of leveraging an Internet-of-Things (IoT) system to provide real-time and highly flexible service creation. In an NFV-enabled Internet-of-Things (NIoT) system, several IoT functions implemented as Virtual Network Functions can be linked as a service function chain to build a customized IoT service quickly. It is important for an IoT service to be able to recover from a failure. However, the supply of a resilient IoT service in an NIoT system is challenging due to the coordination of distributed VNF instances. In this paper, we formulate the problem of resilient service coordination in an NIoT system as a mixed integer linear programming model, namely RSOd. The model offers the optimal resource allocation for minimizing service disruption when a failure happens at a node of an NIoT system. We also develop two modified versions of RSOd for different use cases required by an IoT provider. The evaluation results show that RSOd and its modified versions produce the optimal resource allocation in significantly reduced time compared to previous work. The results suggest that an IoT provider should carefully select an appropriate resource allocation strategy as it has to pay a resource cost to minimize the service disruption.
网络功能虚拟化(NFV)是利用物联网(IoT)系统提供实时和高度灵活的服务创建的一种新方式。在支持nfv的物联网系统中,可以将多个以虚拟网络功能(Virtual Network functions)形式实现的物联网功能链接成一个业务功能链,快速构建定制化的物联网服务。对于物联网服务来说,能够从故障中恢复非常重要。然而,由于分布式VNF实例的协调,在NIoT系统中提供弹性物联网服务具有挑战性。本文将NIoT系统中的弹性服务协调问题表述为一个混合整数线性规划模型,即RSOd。该模型提供了最佳的资源分配,以便在NIoT系统的节点发生故障时最大限度地减少服务中断。我们还为物联网提供商所需的不同用例开发了两个修改版本的RSOd。评价结果表明,RSOd及其改进版本与以前的工作相比,在显著缩短的时间内实现了最优资源分配。结果表明,物联网提供商应该仔细选择适当的资源分配策略,因为它必须支付资源成本以尽量减少服务中断。
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引用次数: 0
A Study on Adversarial Attacks and Defense Method on Binarized Neural Network 二值化神经网络对抗性攻击与防御方法研究
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9943040
Van-Ngoc Dinh, Ngoc H. Bui, Van-Tinh Nguyen, Khoa-Sang Nguyen, Quang-Manh Duong, Quang-Kien Trinh
Binarized Neural Networks (BNNs) are relatively hardware-efficient neural network models which are seriously considered for edge-AI applications. However, BNNs are like other neural networks and exhibit certain linear properties and are vulnerable to adversarial attacks. This work evaluates the robustness of BNNs under Projected Gradient Descent (PGD) - one of the most powerful iterative adversarial attacks, on BNN models and analyzes the effectiveness of corresponding defense methods. Our extensive simulation shows that the network almost malfunction when performing recognition tasks when tested with PGD samples without adversarial training. On the other hand, adversarial training could significantly improve robustness for both BNNs and Deep learning neural networks (DNNs), though strong PGD attacks could still be challenging. Therefore, adversarial attacks are a real threat, and more effective adversarial defense methods and innovative network architectures may be required for practical applications.
二值化神经网络(bnn)是一种硬件效率相对较高的神经网络模型,在边缘人工智能应用中得到了广泛的应用。然而,bnn和其他神经网络一样,表现出一定的线性特性,容易受到对抗性攻击。本研究评估了BNN模型在预测梯度下降(PGD)(最强大的迭代对抗性攻击之一)下的鲁棒性,并分析了相应防御方法的有效性。我们的广泛模拟表明,当使用未经对抗训练的PGD样本进行测试时,网络在执行识别任务时几乎故障。另一方面,对抗性训练可以显著提高bnn和深度学习神经网络(dnn)的鲁棒性,尽管强PGD攻击仍然具有挑战性。因此,对抗性攻击是一种真实的威胁,在实际应用中可能需要更有效的对抗性防御方法和创新的网络架构。
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引用次数: 0
Artificial Noise-aided Adaptive Secure Transmissions 人工噪声辅助自适应安全传输
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9942978
Nhat Nam Phan, S. Q. Nguyen, L. Nguyen
The aim of this paper is to investigate a security solution in the physical layer of a wireless channel. By considering secrecy outage probability, a method of maximizing the average secrecy throughput through adaptive power and transmissions rate with Artificial Noise (AN) will be presented. This system performance secrecy throughput is evaluated by the different impacts of system parameters. The results show that transmissions with AN and with adaptive optimal power control will significantly increase the secrecy throughput.
本文的目的是研究无线信道物理层的安全解决方案。在考虑保密中断概率的基础上,提出了一种利用自适应功率和传输速率在人工噪声条件下最大化平均保密吞吐量的方法。通过系统参数的不同影响来评估系统的性能保密吞吐量。结果表明,采用AN和自适应最优功率控制可以显著提高保密吞吐量。
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引用次数: 0
A Low-Power CT Second-Order VCO-Based ΔΣADC for Audio Recording on Skywater 130-nm 基于低功率CT二阶vco的ΔΣADC在Skywater 130-nm上录音
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9943011
Duc-Manh Tran, Duy-Hieu Bui, Xuan-Tu Tran
This paper presents a low-power, highly-digital Analog-to-Digital Converter (ADC) that aims to meet the requirements of audio recording and processing for Internet-of-Thing (IoT) System-on-Chips (SoCs). In this work, we propose an architecture applying the time-encoding technique and second-order noise shaping ΔΣ modulation. Our design is composed of highly-digital circuits optimized to reach high Signal-to-Noise and Distortion Ratio (SNDR) with low power consumption. The proposed architecture is verified by SPICE simulation. Our ADC obtains an SNDR of 80.7 dB-A, equivalent to 12.3 Effective Number Of Bits (ENOB) at the bandwidth of 24 kHz. This ADC consumes an average of 0.16 mW at the supply voltage of 1.8 V on Skywater 130-nm technology.
本文提出了一种低功耗、高数字的模数转换器(ADC),旨在满足物联网(IoT)片上系统(soc)的音频记录和处理要求。在这项工作中,我们提出了一种应用时间编码技术和二阶噪声整形ΔΣ调制的架构。我们的设计由经过优化的高数字电路组成,以低功耗实现高信噪比和高失真比(SNDR)。通过SPICE仿真验证了该架构的有效性。我们的ADC在24 kHz带宽下的SNDR为80.7 dB-A,相当于12.3有效位数(ENOB)。该ADC采用Skywater 130-nm技术,在1.8 V电源电压下平均功耗为0.16 mW。
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引用次数: 0
A Novel Method for Network Quality based Navigation for Seamless Mobile Services 基于网络质量的无缝移动业务导航新方法
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9942976
Yehan Ukwaththage, Mohamed Yaseer, C. de Alwis, Madhusanka Liyanage
This paper proposes a network quality-based navigation routing algorithm to facilitate users to enjoy seamless access to mobile services in 5G and beyond networks. The proposed algorithm is capable of finding K multiple optimum paths satisfying multiple Quality of Service (QoS) metrics required for a particular mobile application. Relevant QoS parameter values obtained from the data network are projected to road network links. A modified A * based algorithm is developed to find the navigation route that has the minimum travel distance which satisfies the QoS constraints required by the user. Simulation results show that the proposed solution is capable of successfully routing a user while satisfying the QoS requirements. A mobile application-based implementation also validates the proposed algorithm as a viable solution for QoS-based navigation routing.
本文提出了一种基于网络质量的导航路由算法,使用户能够无缝接入5G及以上网络的移动业务。该算法能够找到满足特定移动应用所需的多个服务质量(QoS)指标的K多条最优路径。将从数据网中得到的相关QoS参数值投影到路网链路上。提出了一种改进的基于A *的导航路径算法,求出满足用户QoS要求的最小行程路径。仿真结果表明,该方案能够在满足QoS要求的情况下成功实现用户路由。基于移动应用程序的实现也验证了所提出的算法作为基于qos的导航路由的可行解决方案。
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引用次数: 0
Dual-polarized High Gain Patch Antenna for 5G MIMO Application 5G MIMO应用的双极化高增益贴片天线
Pub Date : 2022-10-20 DOI: 10.1109/ATC55345.2022.9942996
Thi Anh Vu, Toan Do, Duc Nhat Nguyen, Nhuong Quang Tran, Q. Nguyen, Vu Xuan Trung Nguyen, H. D. H. Truyen, M. Le
In this work, a dual-band, dual-polarized mechanical antenna for 5G MIMO application is proposed. By characterizing the surface currents according to specific resonant modes, the patch antenna structure has been reduced in size while the electrical length remains the same. The proposed antenna covers the n40 and the n41 bands ofthe sub-6 GHz 5G applications with a wide bandwidth of 24% $(vert mathrm{S}_{11}vert$ and $vert mathrm{S}_{22}vert leq-15text{dB})$ and a peak gain of 9.2 dBi. In addition, the proposed antenna also has high isolation, and Cross-polar discrimination (XPD) of 25 dB. Due to its mechanical properties, the antenna is a good candidate for mass production and industrial uses.
在这项工作中,提出了一种用于5G MIMO应用的双频双极化机械天线。通过根据特定的谐振模式来表征表面电流,在保持电长度不变的情况下减小了贴片天线结构的尺寸。该天线覆盖了sub-6 GHz 5G应用的n40和n41频段,带宽为24% $(vert mathrm{S}_{11}vert$ and $vert mathrm{S}_{22}vert leq-15text{dB})$ and a peak gain of 9.2 dBi. In addition, the proposed antenna also has high isolation, and Cross-polar discrimination (XPD) of 25 dB. Due to its mechanical properties, the antenna is a good candidate for mass production and industrial uses.
{"title":"Dual-polarized High Gain Patch Antenna for 5G MIMO Application","authors":"Thi Anh Vu, Toan Do, Duc Nhat Nguyen, Nhuong Quang Tran, Q. Nguyen, Vu Xuan Trung Nguyen, H. D. H. Truyen, M. Le","doi":"10.1109/ATC55345.2022.9942996","DOIUrl":"https://doi.org/10.1109/ATC55345.2022.9942996","url":null,"abstract":"In this work, a dual-band, dual-polarized mechanical antenna for 5G MIMO application is proposed. By characterizing the surface currents according to specific resonant modes, the patch antenna structure has been reduced in size while the electrical length remains the same. The proposed antenna covers the n40 and the n41 bands ofthe sub-6 GHz 5G applications with a wide bandwidth of 24% $(vert mathrm{S}_{11}vert$ and $vert mathrm{S}_{22}vert leq-15text{dB})$ and a peak gain of 9.2 dBi. In addition, the proposed antenna also has high isolation, and Cross-polar discrimination (XPD) of 25 dB. Due to its mechanical properties, the antenna is a good candidate for mass production and industrial uses.","PeriodicalId":135827,"journal":{"name":"2022 International Conference on Advanced Technologies for Communications (ATC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122970990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
2022 International Conference on Advanced Technologies for Communications (ATC)
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